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of Rhodotypos again. Here the Walk swings around 

 in a graceful bend to the Seventy-second Street Gate. 

 If you go around with it, as it nears the Drive, to cross 

 it, close by the lamp there, which is on your left, you 

 will find a good sample of the black oak. The black 

 oak is an interesting variety of the scarlet oak. On the 

 lower parts of the tree the leaves somewhat resemble the 

 leaves of the red oak, only are much broader at the top, 

 with a kind of squarish outline. On the upper parts 

 of the tree the leaves run into the more typical forms of 

 the scarlet oak, very deeply cut along the sides, into 

 rounded sinuses (bays) between the thin lobes. These 

 lobes are bristle tipped. The oaks having their leaves 

 tipped with bristles ripen their acorns in the second 

 year, and hence are termed biennials; those without 

 bristles ripen their acorns within the year and, so, are 

 annuals. 



Cross the Drive here and have a look at the Scotch 

 elm which rises up close beside the parapet, on the 

 right of the Drive. It stands near a black cherry. 

 You can tell it at once by its large, rough leaves. 

 If you do not care to go out of the Park here, 

 take the little arm of path that slips off to the north 

 from this Walk, and snuggles down close by the dream- 

 ing waters of a pretty little pond. On your left, in the 

 corner, are some osage oranges, with a handsome witch- 

 hazel diagonally across from them, on the right of the 

 Walk. The witch-hazel has large oval, lop-sided leaves 

 which are distinctly wavy-margined. Crossing the 

 little Bridge here, which is almost hidden away from 

 view in the embowering green, you pass, on your left, 



